python-基于字典值的字典顺序列表

Question

Lets consider the following list of dicts:
ins=[dict(rank=1, data="Pierre"),dict(rank=3, data="Paul"),dict(rank=2,data="Jacques")]

How can I convert it to the following list: ["Pierre", "Jacques", "Paul"]

that is reordering the items with the rank key and only keeping the data key items?

Answer 1

You can do it fairly easily with comprehensions and the sorted() function's key parameter:

ranked_data = [d['data'] for d in sorted(ins, key=lambda x: x['rank'])]

(You can also use operators.itemgetter('rank') instead of the lambda function, but the lambda is easier to use as an example here.)